METHOD OF MANUFACTURING TWO-METAL LAYER TBGA OR FPCB (FBWB) BY REEL TO REEL FROM TAPE OR FLEXIBLE MATERIAL LINED WITH COPPER FOIL ON BOTH SIDES

摘要

PROBLEM TO BE SOLVED: To provide a method of reforming copper foil to the copper foil which does not reflect lasers and drilling blind holes by a direct laser drilling method.;SOLUTION: The copper foil is formed to easily absorb the CO2 laser, to roughen its surfaces, to dye the surfaces black and to reduce a copper thickness in order to lessen energy. Reel-to-reel treatment equipment is internally provided with three chambers for the purposes described above and the copper foil is subjected to each chemical treatment. The copper foil is thus finished to the copper foil which has a copper thickness 1 to 5 μm, surface roughness 1 to 3 μm and black color and permits drilling of only the surface to be irradiated with the laser by the direct laser drilling method.;COPYRIGHT: (C)2002,JPO